Match List I with List II

List I		List II
A	Clostridium butylicum	I	Ethanol
B	Saccharomyces cerevisiae	II	Streptokinase
C	Trichoderma polysporum	III	Butyric acid
D	Streptococcus sp.	IV	Cyclosporin-A

Choose the correct answer from the options given below:

The correct option is A-III, B-I, C-IV, D-II.

To match List I (Microbes) with List II (Products), we can analyze each organism and its commercial application step-by-step:

1. Clostridium butylicum matches with III (Butyric acid):
Clostridium butylicum is an anaerobic, endospore-forming bacterium that is widely used for the industrial production of butyric acid.

2. Saccharomyces cerevisiae matches with I (Ethanol):
Saccharomyces cerevisiae, commonly known as yeast or brewer's yeast, is used to ferment sugars into ethanol and carbon dioxide, making it essential in the brewing and baking industries.

3. Trichoderma polysporum matches with IV (Cyclosporin-A):
Trichoderma polysporum is a species of fungus from which Cyclosporin-A is extracted. Cyclosporin-A is an important immunosuppressive agent used to prevent organ rejection in transplant patients.

4. Streptococcus sp. matches with II (Streptokinase):
Bacteria belonging to the genus Streptococcus produce an enzyme called Streptokinase. It is genetically modified and used clinically as a "clot buster" to dissolve blood clots in patients who have experienced myocardial infarction (heart attack).

Therefore, the correct matching is:
A - III, B - I, C - IV, D - II